Chapter 8 OSPF at TU Berlin

Flashcards and summaries for Chapter 8 OSPF at the TU Berlin

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Study with flashcards and summaries for the course Chapter 8 OSPF at the TU Berlin

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Features of OSPF

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Fast convergence - It quickly propagates network changes.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Note>

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm                        

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

OSPF area is a group of routers that share the same link-state information in their LSDBs.

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs).

Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

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Exemplary flashcards for Chapter 8 OSPF at the TU Berlin on StudySmarter:

Chapter 8 OSPF

Features of OSPF

  •  Classless      
  •   Efficient        
  •  Fast convergence         
  •    Scalable 
  •    Secure - 

Chapter 8 OSPF

Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

Classless - OSPFv2 is classless by design; therefore, it supports IPv4 VLSM and CIDR.

Chapter 8 OSPF

Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

Efficient - Routing changes trigger routing updates (no periodic updates). It uses the SPF algorithm to choose the best path.

Chapter 8 OSPF

Fast convergence - It quickly propagates network changes.

Fast convergence - It quickly propagates network changes.

Chapter 8 OSPF

Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

Scalable - It works well in small and large network sizes. Routers can be grouped into areas to support a hierarchical system.

Chapter 8 OSPF

Note>

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

Administrative distance (AD) is the trustworthiness (or preference) of the route source. OSPF has a default administrative distance of 110. As shown in Figure 2, OSPF has a lower number (making it a preferred routing protocol over IS-IS and RIP) on Cisco devices.

Chapter 8 OSPF

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm                        

Components of OSPF

The three main components of the OSPF routing protocol include:

  •  Data Structures   
  •  Routing Protocol Messages   
  •   Algorithm

Chapter 8 OSPF

           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.

           Data Structures          

OSPF creates and maintains three databases:                    

  • Adjacency database - Creates the neighbor table.    
  •  Link-state database (LSDB) - Creates the topology table.       
  •  Forwarding database - Creates the routing table.

Chapter 8 OSPF

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

Link-State Operation

1. Establish Neighbor Adjacencies 

An OSPF-enabled router sends Hello packets out all OSPF-enabled interfaces.

2. Exchange Link-State Advertisements After adjacencies are established, routers then exchange link-state advertisements (LSAs).

3.Build the Topology Table OSPF-enabled routers build the topology table (LSDB) based on the received LSAs.

4. Execute the SPF Algorithm Routers then execute the SPF algorithm. The gears in the figure are used to indicate the execution of the SPF algorithm. The SPF algorithm creates the SPF tree.

Chapter 8 OSPF

OSPF area is a group of routers that share the same link-state information in their LSDBs.

OSPF area is a group of routers that share the same link-state information in their LSDBs.

Chapter 8 OSPF

OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs).

OSPF can be implemented in one of two ways:

Single-Area OSPF - In , all routers are in one area called the backbone area (area 0).      

  Multiarea OSPF ,OSPF is implemented using multiple areas, in a hierarchal fashion. All areas must connect to the backbone area (area 0). Routers interconnecting the areas are referred to as Area Border Routers (ABRs). 

Chapter 8 OSPF

Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

Note: Routers in other areas receive messages regarding topology changes, but these routers only update the routing table, not rerun the SPF algorithm.

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